/* ==========================================================================
   GLOBAL HEADER / NAV
   Sits transparent over the dark hero, turns solid on scroll (.is-scrolled).
   ========================================================================== */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  transition: background var(--dur) var(--ease-out),
              border-color var(--dur) var(--ease-out),
              box-shadow var(--dur) var(--ease-out);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--border);
  box-shadow: var(--elev-1);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  height: 76px;
}

/* ---- Brand / wordmark ------------------------------------------------- */
.brand { display: inline-flex; align-items: center; gap: var(--space-3); }
.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  background: var(--gold-500);
  color: var(--navy-900);
  font-family: var(--font-display);
  font-weight: var(--fw-heavy);
  font-size: 1rem;
  letter-spacing: -0.02em;
}
.brand__text { line-height: 1.1; }
.brand__name {
  display: block;
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--white);
  transition: color var(--dur) var(--ease-out);
}
.brand__role {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate-300);
  transition: color var(--dur) var(--ease-out);
}
.is-scrolled .brand__name { color: var(--navy-900); }
.is-scrolled .brand__role { color: var(--slate-500); }

/* ---- Desktop nav ------------------------------------------------------ */
.nav { display: none; }
.nav__list { display: flex; align-items: center; gap: var(--space-6); }
.nav__link {
  position: relative;
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: rgba(255, 255, 255, 0.82);
  padding-block: var(--space-2);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1.5px;
  background: var(--gold-500);
  transition: width var(--dur) var(--ease-out);
}
.nav__link:hover { color: var(--white); }
.nav__link:hover::after { width: 100%; }
.is-scrolled .nav__link { color: var(--slate-500); }
.is-scrolled .nav__link:hover { color: var(--navy-900); }

.header__cta { display: none; }

/* ---- Mobile toggle ---------------------------------------------------- */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  padding: 10px;
}
.nav-toggle__bar {
  display: block;
  height: 2px; width: 100%;
  background: var(--white);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease-out),
              opacity var(--dur) var(--ease-out),
              background var(--dur) var(--ease-out);
}
.is-scrolled .nav-toggle__bar { background: var(--navy-900); }

body.nav-open .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-toggle__bar:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Mobile drawer ---------------------------------------------------- */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: var(--navy-800);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--gutter);
  transform: translateX(100%);
  transition: transform var(--dur-slow) var(--ease-out);
  visibility: hidden;
}
body.nav-open .mobile-nav { transform: none; visibility: visible; }
.mobile-nav__link {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
  color: var(--light-100);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--dark-border);
}
.mobile-nav__link:hover { color: var(--gold-400); }
.mobile-nav .btn { margin-top: var(--space-6); }

/* ---- Desktop breakpoint ---------------------------------------------- */
@media (min-width: 960px) {
  .nav { display: block; }
  .header__cta { display: inline-flex; }
  .nav-toggle, .mobile-nav { display: none; }
}